Spark-plug mounting



June 24, 1930. o, BITCHMAN SPARK PLUG MOUNTING Filed 001.. 8, 1929Patented June 24, 1930 Y.

' UNITEDSTATES osoAR BITCHMAN, or HABANA, CUBA fsrARx-rriue MOUNTINGApplicaten mea gember s, 1929. semaine. 358,215.

TheV present invention is directed to improvements in spark plugmountings.

The primary object of the invention is to provide a device of thischaracter so con- V structed that when the plug is removed the plugopening of the cylinder will be closed to prevent the escape ofexplosive gases from the cylinder, thereby preventing any possibility ofan explosion. Y

19 Another object of the invention is to provide a device of thischaracter constructed in such manner that when oney plug of the seriesor set is removed for replacement or repair it will not be necessary to35 stop the engine. f

Another object of the invention is to provide a mounting of thischaracter so constructed that the plug will be housed and protectedagainst collection of oil and car- 2@ bon thereon, therebvv maintainingthe engine at a high point of efficiency.

Another object-of the invention is to provide a device of this characterso constructed that it can be operated or manipulated to permit removaland replacement of a plug in a comparatively short time.

Another object of the invention is to provide a device of `thischaracter so constructed and arranged in such manner that .30 the sparkplug opening of the cylinder will 1 be effectively closed so as Vtoeliminate noise while the spark plug is being changed, it being obviousthat should the gas under pressure in the cylinder be ,dischargedtherefrom, considerable noise will result. l

Another object of the invention. is to provide a device of this kindwhich is eX- ceedingly simple in construction, efficient in operation,durable, and one which can be 4d manufactured at a minimum cost.

i With these and other objects in view, this invention resides in thenovel features of construction, formation, combination and arrangementof parts to be hereinafter more ,45; fully described, claimed andVillustrated in the accompanying drawings, in which:

Figure 1 is a vertical central sectional view through the device,showing it nposition upon a portion of a cylinder.

Figure 2 is a similar view showing the mounting in position "to close`the /plug Opening@ Y 1v Figure 3 is a sectionall vie-W Aon the line ofFigure l Figure 4e is a perspective viewof the plug `55 and ring innon-assembled relationship. f 'Figure' 5 is a verticalv sectional viewthrough the plug, showing the same mountedin a bushing.

Referring to the drawings,y 1 designates 60 Y' a portion of an internallcombustion en ine cylinder, in this instancethe head, an vin which `isformed, asfis 'customarl the threaded opening 2; "'Theinner'sur acerofthe "head is provided with a conical seat'B, 05 the purpose ofV whichwill be laterV eX- 'plained,

"The mounting 'includes an eXterio-rly threaded hollow plug 4 having asquare tool engaging head 5 upon its upper end, 'w whereby a suitabletool may be employed for applying the plug tothe cylinder or removingthe same therefrom;v f

The plug is closed `at itslower endand has its Wall formed with aplurality of ra- 75' dially disposed ports 6, preferably seven in'number.-""

The plug' is exteriorly threaded upon its lower end, as at 7 ,andthreadedithereon isI the ring whichconstitutes a valve 8 adapted .90toengag'e the seat 31Whenfthe spark plug 9; is removed.l .'lhe sparkplug 9 is of Vconventionaleform andis threaded inthe plug' 4,. thevelectrodes thereof vbeingv located slightly labovethe plane of theports"`6. Whenthe spark plug'9 is engaged in the plugi, archamb'er A islprovided between the spark plug and the closed end of the plug 4, sothat when the compressed charge lof fuel enters this chamber'it will behighly compressed.` Obviously, whendgnition of the gas .takes placeinythe chamber A, the flame Willppass through the ports 6 4and ignite thecompressed vcharge Within the cylk inder, and owingl to the restrictednature Y of the'port 6,4the flame ejected therefrom, will be inblast-like form, thus insuring proper ignitiongof the gases Within thecylinitier. In .this manner, the explosion .will ,"f i

be very effective in operating the piston within the cylinder.

The combined cross sectional area of the lower end of the plug 4 and thering 8 will provide a elicient deflector to prevent oil from enteringthe chamber A through the ports 6, and should any carboncollect withinthe ports 6, the blast of the flame will dise charge the same, thusmaintaining the chamber A and the spark plug in a thoroughly cleancondition.

When it is desired to remove the spark plug 9 it is only necessary toplace the proper tool upon the head 5 and rotate the plug to thread thesame upwardly'in the opening 2, whereupon the ports 6 will be coniinedin the opening 2, and the ring 8 will engage the seat 3, thusellectively sealing ,the cylinder and preventing gases therein escapingto the atmosphere While the plugis being removed or replaced. After thespark plug has been replaced, .the rotationof the plug 4 is reversedsothat the ring 8 will disengage the seat 3 and the ports 6 will openfreely into the cylinder.

4'Ihering 8 is threaded upon the plug 4 in a left hand direction sot-hatwhen the ring engages the seat, the tendency will be to more Y:firmlysecure the -ring upon the plug. The ring .8 has a beveledupper face l()in order to assume a leaf-proof joint when the ring is engaged in theseat 3.

. The ring 8 is of greater diameter than. the opening 2 and is obviouslyapplied tothe plug aftersaid plug has been threaded in said opening. v

Owing vto the multiplicity of ports 6, a number of jets of flame will beemitted from the chamber A to more effectively ignite thecompressedcharge of gas in the combustion chamber of the cylinder.

In Figure 5, the plug A is shown engaged in a bushing l1 so that the`plug can be applied to a marine engine.

l From theA foregoing, it is thought that the operation and manyadvantages of the here-V in described invention will be apparentto those.skilled in the art without further descriptionand it will be understoodthat various changes in size, shape, proportion, and minor details of.construction may Ibe resorted to without departing from the spirit orsacricing any of the advantages of the invention.

AIVhatiis claimed is:

An internal combustion engine having a threaded opening in its wallcommunicating with a coinbustionchamber, a hollow plug open at its upperend and closed at its inner end, the plug being externally threaded forengagement with the threads of the opening and having its inner endportion projecting into the combustion chamber when the plug isy screwedtightly into the opening, side ports being formed through the walls ofthe plug adjacent its closed inner end, the wall of the engine beingformed with an annular seat about the inner end of its Opening, a collarabout said plug between the ports and the inner end of the plug, theports being adapted to be closed by the walls of the plug receivingopening when the plug is screwed outwardly and the collar constituting avalve head engageable with the seat when the plug is screwed outwardlyto tightly seal the inner end of the plug receiving opening about theplug, and a spark plug removably mounted in said plug above theV portsand removable through the open upperend thereof.

. In testimony whereof I aiiX my signature.

OSCAR BITCHMAN. [L s]

